DE1483857A1 - Roller drill - Google Patents

Description

Parksixa grease U83857

Heed Roller Bit Company, Houston, - $ exas, U.S.A.

Roller drill

The invention relates to drilling tools for large holes and deep holes. Type of line drill, in particular drilling tools, which are used to produce boreholes with a relatively large diameter, and also a device for removing the cuttings * ^ ⁰ . ¹¹¹ Bottom of the borehole.

In the production of deep bores, wells and the like. A drill head, on the lower part of which roller bits are mounted, is connected to the lower part of a hollow central drill rod that is set in rotation, the bits roll on the bottom of the borehole, which to It is created for the purpose of crushing stone saffets au-f-aubrecfaeneder. A flushing medium, which can consist of a gas or a liquid, is pumped down to the drill head and rises to the surface of the earth in order to cool and clean the cutters and to remove the cuttings from the borehole.

The flushing medium can be pumped down through the drill rod and the drill head and rise to the surface of the earth in the space between the drill rod and the borehole wall, carrying the cuttings out of the borehole. A reverse flow of the flushing medium can be achieved because the flushing medium around the drill rod! around down and then wia? d pumped up through the interior of the drill rod. A double-walled drill pipe can also be used, in which case the medium between the inner and outer drill pipe is pumped down and can rise through the interior of the inner pipe of the double-walled tube to the surface of the earth. This shows that the circulation of the flushing medium can take place in different ways, but the flow velocity of the returning flushing medium must be so great that this drilling material can be carried away from the working surface of the borehole

BATH ORIGINAL

909888/0023

One of the most important punctures that must be performed by the circulating flushing medium is to quickly remove the separated or reduced rock particles from the bottom of the borehole and from the rollers. This function is not always effectively solved, especially when making large diameter boreholes, which is due to the volume required by the circulating medium and the flow velocities required to entrain the cuttings and carry them to the surface of the earth is not removed quickly, it can be crushed again by the chisel rollers, and the rock particles can accumulate around the block bits and between the bit and the bottom of the borehole, so that the roller bits can no longer rotate on their axes, on the bottom of the Grind the borehole and ground it when worn. This will reduce the life of the roller drill. Such "clogging of the roller bit by rock is usually known as" agglomeration ".

The invention has for its object to provide a new and improved roller drill with devices that ensure that the spray medium solves the desired task, namely, the stone particles from the bottom of the borehole and out quickly removed from the area around the roller bits.

The roller drill should also be suitable for the rapid production of a borehole with a relatively large diameter. The roller drill for the production of large boreholes is intended to carry along drilled material generated in the course of the drilling process and to guide it back through the drill rod to the surface of the earth. The roller drill should also have a new and improved cuttings receptacle. The new cuttings receptacle for the roller drill should also increase the speed of the flushing medium between the bottom of the borehole and the cuttings receptacle, as well as in the drill rod.

BATH ORIGINAL

909888/0023

The drill cuttings for the roller drill should finally be extend in the radial direction, from a point in the height of the axis of rotation of the roller drill to a point in the vicinity of the nominal diameter or the wall of the borehole,

According to the invention, this object is achieved by a drilling tool for deep boreholes, which has a drilling head to which a number of Ueipelanformen are attached, which extend downward therefrom wA ßo a-ioorder, cla _f ; They work out paths at the bottom of a borehole, a hollow Bohratan & e, which is connected to the drill head and sets the roller drill in! is arranged at a small distance from the bottom of the borehole and is in connection with the interior of the hollow drill rod, so that the flushing medium can circulate through the Bohrgutaufnähme and the drill rod upwards, the distance of the bottom of the Bohrgutaufnahme from the 3oden of the borehole is chosen so that dap the speed of the flushing medium circulating underneath is increased considerably in order to increase the absorption or removal of the cuttings produced during the drilling process.

According to a further feature of the invention, the drilling tool contains a Bohrkopfι to which a number of chisel assemblies are attached, which extend downwardly from this and are arranged so that they work out paths at the bottom of the borehole, a hollow drill rod connected to the drill head is and the roller drill is set in rotation and an elongated Bohrgutaufnahme on the drill head, which extends from the central portion to the circumference of the drill head and is in communication with the interior of the drill rod, wherein the Bohrgutaufnaame is assigned to the bottom of the borehole, so that the drillings through liineinzirkulierenkänn this recording upwardly in the drill rod. ^s

BADORiGtNAL '

The invention will now be described in detail also with reference to the accompanying drawings of a Ausführungsbeispieis, all from the description and the figures arising .Specifics or features to achieve the object in binne the j £ rfindun _a Künne contribute and with the will to patent in the application ^ er-o ^ imen were, jss lines:

ϊϊλ. J. a view of aes Äolj.enbohrers from below, from the particular the mutual subscription of the Ileij ^ elrolle and the Arrangement of the ear material is evident.

Pig. 2 is a sectional view of the roller conveyor shown in FIG. 1, aie sche..iatisch: as Ziriiulatioussystem dec. Roll-., '..r-.rs eaä. -er Jrii-ui -.- isei t.

ri.j. ik ei ^ e och ..i cO & .r.bio ^ t along line 3a - ^ A in Fig. 2, which shows an ArLi'üi-run-- the Boiirjut recording of the invention.

Pig. 3B to 3L of the jsig. 3A Similar views of various Executions by johr-.utaufr.ahiaen.

4 shows a diagram of a drilling tool in an other Ausfu_.ruiir ^ emclp cer invention which is an amended Has circulation system.

FIG. 5 is a sectional view along the line 5 - 5 in FIG.

In the fi ^. 1 una 2 is a fiollenbohrer 10 according to the invention gezei ₀ t, which has a drilling head. 11 The drill head oeeitzt a Uiixere plate 12 and an upper plate 13. A cylindrical part 14 extends through the plate 13 downwards, and is connected to an elongated suction part 15 extending in the radial direction and to the plate 16. The plate 16 is attached to the plate 13 by screws 17. An outer cylindrical spacer 18 is arranged between the plates, and reinforcement ribs 19 are circumferentially around the drill head on the cylindrical spacer

909886/0023 BAD o « _G! NAL

part 18 and the plates 13 and 12 welded. The cylindrical Spacer 18 is also by Yerschweißung with the blades 12 and 13 connected. Central chisel arrangements 20 are screwed or otherwise fastened to the lower surface of the plate 12 21 are also attached to the lower surface of the plate 12 in the same way. One every chisel arrangement is on a downward and inward running wave (nioht shown) on which the chisel rollers are mounted. The chisel rollers can have conventional son's rear teeth or cutting elements and are placed on suitable bearings in a known manner be stored.

As can be seen, "the chisel assemblies 20 are centrally located" to work on and near the drill axis "and the chisel assemblies 21 are arranged to locate intermediate tracks and tracks in the depth of the wall 22 . Work out the borehole »whereby the entire bottom of the borehole is drilled out.

The cuttings receptacle or the suction funnel 15 runs in form of a relatively narrow opening, which, as from the pig. 2 and 3A to 3E can be seen from the rear Plate 23 and the front plate 24. · The plates »which with respect to the rotation of the suction funnel anterior and posterior cortex form, extend relatively close to the bottom 25 of the borehole. If there is a medium, e.g. air or water, around the drill rod 14 pumped around near the bottom against the bottom 25 of the borehole is, the medium returns to the drill rod 14, where it carries through the cuttings suction funnel 15 cuttings and debris, which occurs when drilling. It is noted that the great Volume of the medium around the drill rod 14 and between this and the wall 22 of the borehole is pumped downwards, now awangsaken by the relatively small The opening of the suction tube 15 is pressed through is j with a given volume of the in this way

BATH ORIGINAL

circulating medium, the speed * is increased, whereby the desired removal of cuttings from the work area the keipeirollen is strengthened or improved.

Since the cuttings suction funnel 15 extends relatively close to the bottom of the borehole, it is obvious that the speed of the borehole, the z._ ;. flows into the radial intake funnel 15 on the front plate, increases due to the narrowing of this passage. Since the complete roller drill is rotated by the drill rod 14 and the Bohr /, - ut-Änsaugtrichter 15 extends from the center of the borehole to α essen V / andung, when the roller drill sr is rotated, the drillings suction funnel 15 is also rotated The entire bottom of the hole is cleared of borehole or other debris. S ^{1 For} the lower parts of the cuttings suction funnel, different 3 oraen vur _ö fcseh = nv / earth, e.g. 3. the one that is in the iig. 'A is shown. In this case, a flexible part 2b, which is made of an iieoprene I <appen or the like, is fastened to the rear plate 23 by means of screws 27. The part 26 works on the bottom of the borehole as a scraper or .atnelimer. At the lower end of the part 24, a front extension plate 28 can also be attached by welding or the like. In this case, the speed of the medium between the plate 28 and the "bottom 25 of the borehole is maintained over a longer distance, vua das to pick up and carry away the mentioned rubble or drilled jut.

The fig. 33 shows a suction arrangement like that just described is similar, but with a flexible scraper 29 on the front plate 24 of the cuttings suction funnel is appropriate.

The J? Ig. 3D shows an inlet to the cuttings suction pipe, the is similar to the one just described, but this embodiment lacks the front extension plate 28 and the · front scraper 29.

BAD ORiGiNAL

909886/0023

in oiit ;. > ± ^ e ^ one detail has the full outer JFort-5 Zo and a rear jfoftsatz 30, uia an inside-

Railway with a high degree of medium-S-driftness between these ports and the bottom of the jox Achieve, whereby -ie drill cuttings is increased.

The Jiö · 4un-J b lines an embodiment of the invention, u ^ e is particularly for the use of air as a circulating, eeicXet. there arises a problem aes i * a3ser-

on, which is back? ο1 ^ "& has, cap in the borehole water. Under these circumstances, a double-walled drill rod 31 is used in a method used in ι er Iraxis and compressed air is passed down into the annular space 34 between the pipes 32 and ^ 3 , which emerges from the openings 4u near the jocien of the borehole and rises through the inner space 39 of the rurea 35, whereby the water is sucked out of the borehole through this outer tube and furthermore a circulation of the water around the borehole is effected The improvement that this embodiment brings is that part of the compressed air, which is pumped down through the annular space 34, is discharged via the line 35 and the throttle valve 36 into the distribution pipe 37 for the medium . The manifold can be attached to the front port set 28 and have openings 58 arranged to direct the compressed air downward between the front plate 28 and the bottom 25 of the wellbore. Here, all the compressed air mixes with the water, circulates upwards through the Bohrtrut suction funnel 15, whereby the speed of the medium flowing back is increased. The amount of air that is discharged through aie oefinun ^ en 38 and 38 can be regulated by adjusting the valve. This is set before the roller drill is driven into the borehole. This setting can also be determined empirically. Suction devices according to the invention, it has been found to be useful, only see one in the radial direction

9008 86/0 013 BAD

Extensive opening to be provided, as shown in the figures is shown. With this arrangement, only a minimal amount of space is required at the bottom of the roller tube for the cuttings suction funnel required, and albeit more than one Eohrgut funnel can be provided *: ann, but it turned out that

dap a cuttings-intake tube extending from the center of Johrlocij.es to the wall, in very 3etrieb IeI-s "uun <, sfäiii _ö JLSt. iit 'is further toward iaraui _t .evvieuen, inter alia, WTRM ^ icr. aer jxollenoo. .rer arfci.t, also the Jciir ^ ut funnel with the fiollenbohrer circulates, wherein the bottom of the borehole gesa .te durc- α-en iDohrjut AnBaugtrichtür is crossed the flow of the circulating medium is therefore zwangsj.Lufi _t naiie uea bottom AEC uolirloclies gefUiirt, and the arrangement of the ijohr ^ ut-A ^ ^ sow hopper being such that Greschwindi _o iceit DTT. zirAulierenäen idediums dap increased and thereby the LeiütuiijäofLiiigkeit the opüiung of the circulatory system is enhanced.

> / Eiin the drilling. ^ ut-Ax ^ saüetrichter according to the invention is angeord net, is :: iehr 5.au ^ i for the chisel arrangements .am drilling head at your disposal and also can throw them generous to ijeoranet, v / as a represents another advantage.

BAD ORIGINAL 909886/0023

Claims (9)

1. Eollenbohrer for deep drilling and the like. With a drill head to which a number of chisel assemblies are attached, which extend downwardly from these and are arranged so that they work out paths on the bottom of a borehole / * a hollow drill rod, which with is connected to the drill head and sets the roller drill in rotation, and with a line arrangement which circulates a flushing medium around the drill rod and && Ά drill head downwards, characterized in that a hollow Bohrggtaufnahme (15) at a small distance - next to the bottom (25) of the borehole is arranged and with the interior of the hollow drill rod (14) in connection, soiäaß the flushing medium can circulate through the Bohrgutaufnahme and the drill rod upwards, and that the distance of the bottom of the Bohrgutaufnahme to the bottom of the borehole is chosen so that the The speed of the flushing medium circulating below is considerably increased n extent to be discharged. 2. Roller drill according to claim 1, characterized , that the cuttings receptacle (15) is elongated and extends from the center auia ΪΤ & · « catch of the drill head (11) extends, 3. Roller drill according to claim 1 or 2, characterized characterized in that the Bohrgutaufnahm © has at least one flexible file (2 ^) which is attached to a Bottom section (23) of the same is attached and the hem- «wipe bridged the bottom of the Bohrgutaufjiahine and the bottom of the borehole. 4. Role drill according to claim 1, 2 or 3, characterized in that _t (24) of Bohrgutaufnahme is fixed (15) Sin ^ r-fea ^ iäfc- (28) at the lower Feil, in!; in terms of the. Direction of rotation of the drill head (11) extends forward away from the receptacle | U83857 5. Roller drill according to claim 1, 2 or 3 »thereby marked that on the lower part (23) of the Bohrgutauf would take (15) an extension (30) is attached, d'er in relation to the rotary device of aes drill head (11) of the recording extends away backwards. 6. Roller drill according to claim 1, 2 or 3 _f, characterized in that the lower leij of Bohrgutaufnähme (15) has a plurality of extensions (28, 30), with respect to the direction of rotation of the drill head (11) of the one extension forward and the other process extends backwards. 7. RolleboLrer according to one or more of the preceding claims, characterized in that it has a first and second channel (34 _f 39) in the drill rod (31), the flushing medium circulating through the first channel (34) downward through the line arrangement is and the hollow Bohr ₆ utaufnähme (l>) on the drill head is in connection with the second channel (39). 8. Hollen borer according to claim 7 »characterized in that that the drill rod (31) has a conduit means (40), un part of the circulating Flushing medium from the first channel (34) at a point above the bottom of the borehole into the second Branch off channel (39). 9. roller drill according to claim 7 »characterized in that it comprises a conduit means (35, 36, 37) zufuhrt a predetermined portion of the circulating flushing medium a location adjacent to the erector Ans (15) of the Bohrgutaufnahme lie _ö t. BATH ORIGINAL 909886/0023